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TB62734FMG Fiches technique(PDF) 6 Page - Marktech Corporate

No de pièce TB62734FMG
Description  Step Up Type DC-DC Converter for White LED
Download  14 Pages
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Fabricant  MARKTECH [Marktech Corporate]
Site Internet  http://www.marktechopto.com
Logo MARKTECH - Marktech Corporate

TB62734FMG Fiches technique(HTML) 6 Page - Marktech Corporate

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TB62734FMG
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[Setting of capacitance of output side]
The larger than C2=0.47(uF) should be recommended.
[Setting of external Inductor size]
Reference) According to the number of LED, the inductor size should be selected larger than the value
indicated in the table.
Number of LED
Vin=2.8V
Vin=4.3V
Note
2
3
4.7
3.6
4
6.8
4.7
5
8.1
6.8
6
10
8.1
Io=20mA
Unit : uH
[Setting of Io]
Resistance connects between RSENS pin and GND.
The resistor of RSENS (K terminal and Ground) is for setting of output current (Io).
The average current is set by this RSENS value and average current are obtained by the following equation.
(Please choose a equation according to the number of LED)
2LED : Io = 119.16 × Rsens
-0.8399
3LED : Io = 115.32 × Rsens
-0.854
4LED : Io = 113.08 × Rsens
-0.8614
5LED : Io = 108.02 × Rsens
-0.8534
6LED : Io = 106.71 × Rsens
-0.836
It is an equation when setting up by inductor of the size which we recommend.
When different L from the size which we recommend is used, The average current cannot be computed with
the above-mentioned equation.
RSENS vs Iout
Vin=3.6V
10
15
20
25
30
35
40
45
50
02
4
6
8
10
12
RSENS(Ω)
2LED
3LED
4LED
5LED
6LED


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